Abstract
Ⅰ. Introduction
Ⅱ. Causality and Necessary Condition
2.1 Necessary Condition and Sufficient Condition
2.2 How to Test Necessary Condition
Ⅲ. Statistical Analysis and Results
3.1 Data Collection
3.2 Validity and Reliability
3.3 Testing Necessary Condition of PEU to BI
Ⅳ. Conclusion
References
논문초록